Nozzle



' Dec. 17, 1940. .1. E. HOLVECK NOZZLE Filed Nov. 22, 1938 JosephEhulveck l VENTOR ATTORNEY Patented Dec. 17, 1940 UNITED STATES PATENTOFFICE,

Application November 22, 1938, Serial No. 241,757

1 Claim.

In nozzles of this type it is highly desirable that the stream of liquidissue from the nozzle in as compact a form as possible, and with itsflow uninterrupted so as to obtain maximum cutting action of the fluid.

The high velocity at which the water or other liquid issues from thenozzle causes considerable wear on the flow passage of the nozzle,particularly at and near the outlet end, and one object of the presentinvention is to provide a nozzle structure embodying a replaceable tipor outlet portion which may be easily, quickly and inexpensiveiyreplaced when it becomes worn.

While the wear on the flow passage of the main body of the nozzle is notnearly as great as the. wear on the flow passage near the outlet,

nevertheless there is some wear on the main body, and since this wearvaries in each individual nozzle, it is practically impossible to alignthe flow passage of a replacement tip with the flow passage of thenozzle body with the degree of accuracy needed to prevent distortion ofthe flow liquid and interference with its eillciency or to prevent theformation 0! vortices in the flow which result in cavitation of thenozzle, particularly at the joint of the replacement tip and body.

It is, therefore, an object of the present invention to provide a nozzlestructure in which a worn tip may be replaced, and in which any 40detrimental efiects on the fluid flow which might be caused by slightmisalignment of the flow passages or by vortex-forming obstructions inthe flow passage will be prevented.

With these and other objects in view, as may 5 appear from theaccompanying specification, the

invention consists of various features of construction and combinationof parts, which will be first described in connection with theaccompanying drawing, showing a nozzle embodying the invention, and thefeatures forming the invention will be specifically pointed out in theclaim.

In the drawing: 7 V Figure 1 is a side elevation oi the improved nozzle.1

Figure 2 is a longitudinal section through the nozzle. 1

Figure 3 is a cross-section taken on the line 3-3 of Figure 2.

Referring more particularly to the drawing, 5 the improved nozzle Iconsists of the main body 2, the detachable tip 3, and the coupling 4,providing in eflectl a two piece nozzle, the outlet portion oi the flowpassage of which is formed in the tip 3 so that when the flow passage 5of w the tip becomes worn to such an extent as to interfere with theproper discharge stream from the nozzle, it may be readily and easilyreplaced without requiring replacement of the entire nozzle. 15

The nozzle body 2 has a flow passage U, which tapers inwardly towardsits axis uniformly throughout its length from its entrance end to itsoutlet end or exit end, where it' opens into the inlet end of the howpassage I, formed in go the tip I.

The major portion of the flow passage 5 of the tip I is tapered at thesame degree as the taper of the flow passage 6, and forms an aligningcontinuation thereof. However, near the outlet end of the tip 3, thepassage 5 straightens out and is of uniform diameter for a shortdistance inwardly of the tip from its exit, as shown at 1. The outletend of the tip 3 is provided with a countersink 8, which surrounds theout- 30 let end of the flow passage I so as to prevent sharp corners atthe outlet end of the tip 3, for the purpose of reducing feathering" ofthe liq- "uid stream flowing from the nozzle.

The main body 2 of the nozzle is provided a with a countersink 8 in itsoutlet end concentric of the flow passage 8, and this countersinkreceives the inner end ofthe annular flange it formed upon the tip 3, soas to properly center the tip a relative to the body 2. The coupling 0-member 4 is threadably attached to the body 2 and has an inturnedflange Ii which engages the under side of the flange It for securelyholding-the tip 3 connected to the body 2.

For the purpose of preventing the formation cl vortices orinterruptionsto the flow of the high pressure liquid flowing through thenozzle it is necessary that the wall portions of the flow passages 5 and8 be in accurate alignment, and that no part of the wall of the flowpassage 5 50 projects inwardly of the wall of the flow passage 6 at thepoint of junction. The greatest wear caused by the flow of liquid orwater through the nozzle is in the tip 3, because it is in this portionthat the stream reaches its greatest rell duction in cross-sectionalarea, but nevertheless there is some wear on the walls of the flowpassage 6, so that it would be impossible to make an accurate alignmentof the flow passage of the tip 3 with the flow passage of the body 2when a replacement tip was substituted for a worn one. This is renderedpractically impossible, partially because wear on the walls of the flowpassage 6 is never the same in two nozzles, and also because of thegreat'difiiculty in machining the flow passages 5 to accurately alignwith the flow passages 6 of a body to which the tip is to be attached,particularly since it is desirable and practical to manufacture the tipsat the source of manufacture and supply them as stock items, forreplacement. Therefore, for the purpose of permitting the use of stocktips for replacement, and to assure proper aligning of the flow passagesof the replacement tip with that 01' the body, the flow passage of thereplacement tip 3 is cut for a short distance inwardly from the entranceof the tip at an angle or taper greater than the angle or taper of thetapered portion of the flow passage of the body 2, providing an openingat the entrance end of the tip 3 which is greater in diameter than thediameter of the outlet end or exit of the flow passage 6, and whichgradually tapers and merges into the tapered portion of the flow passag;5. This in-' creased taper and enlargement of the flow passage 5insures, first, accurate alignment of the flow passage 5 with the flowpassage 6, and secondly, insures against any portion of the wall at theentrance to the flow passage 5 from projecting inwardly of the wall ofthe flow passage 6 at its exit end, even though the walls of the latterpassage be worn, and thereby insuring the free and uninterrupted flow ofthe water or other liquid through the nozzle and preventing theformation of vortices at the joint between the body 2 and the tip 3.

It will be understood that the invention is not to be limited to thespecific construction or arrangement of parts shown, but that they maybe widely modified within the invention defined by the claim.

' What is claimed is:

. A high pressure nozzle comprising a main body having a bore taperinguniformlyfrom its entrance to its exit and having the external surfaceof the body near the exit end of the nozzle screw threaded, a removabletip having an annular flange on its entrance end, said main body .beingcountersunk for receiving said tip, an attaching nut engaging the undersurface of said flange and threaded onto said body for securely clampingthe tip in engagement with, the body, the main portion of the bore ofsaid tip tapering uniformly with the bore of said body to a point ashort distance inwardly from the outlet end of the tip where said boreis of uniform diameter for a pre-determined distance, the bore of saidtip at its entrance end being tapered at a greater angle than the angleof taper of the body bore to provide an entrance to the bore of the tipgreater in diameter than the exit of the bore of the body, said tiphaving a countersink in its outer end to prevent feathering of liquidflow from the nozzle.

JOSEPH E. HOLVECK.

